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University of Arizona (1977)

LEAF ANALYSIS AS INDICATION FOR SALT ACCUMULATION UNDER TRICKLE IRRIGATION

Abbass, Ahmad Khidhayir

Titre : LEAF ANALYSIS AS INDICATION FOR SALT ACCUMULATION UNDER TRICKLE IRRIGATION

Auteur : Abbass, Ahmad Khidhayir

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1977

Résumé
Despite the apparent benefits that can be achieved by using a well-managed trickle-irrigation system, in place of other methods of irrigation, it is subject to potential buildup of salinity in the root zone. Moreover, with trickle irrigation, point sources of water cause soil salinity to vary in the horizontal as well as the vertical plane Therefore, there is uncertainty about depth or depths from which samples should be taken to be indicative of the response of the crop. This work was aimed to provide a diagnostic technique for obtaining a quick and accurate means of evaluating the salinity status of root-zone soil from the correlation of soil salinity (ECe x 10 ) with Na and/or CI concentration in the leaf tissues. From these studies made on irrigated citrus, there is evidence that Na and CI concentration in the leaves increases sharply as the need for leaching develops. The statistical analysis of citrus trees root-zone soil and leaf salts showed there was a significant effect of the different emitter geometries, the amounts of water applied, and the combined effect of both on salinity levels in the soil as well as on the uptake and accumulation of CI in the leaf tissue. In addition, the same factors, except the amounts of water application, resulted in significant differences upon the accumulation of Na in the leaves. Time of leaf sampling is highly significant with respect to the kind and concentration of salts found in the leaf tissues. Moreover, salinity of the soil profiles upon the different treatments was affected significantly (p : 0.01) by the depths and sampling locations. The correlation of soil salinity (ECe x 10 ) at the root zone with the Na and CI in the plant leaves is discussed.

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